JPS62296737A - Permanent magnet field synchronous machine - Google Patents

Abstract

PURPOSE:To enable sufficient cooling even when the housing at the rotary output side is covered by any device, by a method wherein a cooling medium flow path for flowing of a cooling medium is installed in the housing at the rotary output side. CONSTITUTION:A permanent magnet field synchronous machine is composed of a rotor 2 having a permanent magnet 3 installed on a rotary shaft 1, an armature core 5 installed on a housing 7, and an armature winding 6. A cooling medium flow path 15 for flowing a cooling medium such as water or oil is installed at the rotary output side of the housing 7. The cooling medium flow path 15 is installed so that the cooling medium flowing from an inlet port 16 is rotated by one revolution around the rotary shaft 1 and flows out of an outlet port 17. In this constitution, the armature winding 6, the armature core 5 or the like can be cooled sufficiently.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a permanent magnet field synchronous machine having a disk-shaped rotor on which a plurality of permanent magnets are arranged.

[Conventional technology]

Such a synchronous machine is conventionally known, for example, as shown in FIG. In this figure, l is a rotating shaft, and 2 is a rotor fixed to the rotating shaft l. The rotor 2 is formed into a disk shape as shown in FIG. 6, and permanent magnets 3, S poles and NWAs are arranged alternately on both sides of the rotor. The permanent magnets 3 have a fan shape, are arranged radially at approximately equal intervals around the rotating shaft 1, and are fixed to the rotor 2 by adhesive. 5 is an armature iron core, and 6 is an armature winding, each of which maintains a slight clearance with respect to the rotor 2. A housing 7 is fixed with a bolt 9 with a spacer 8 sandwiched therebetween. Fins IO for heat radiation are formed on the outer surface of the housing 7 (SAE Vapor 830111). In addition, 11 is a ball bearing, 12 is a backing plate that suppresses the ball bearing link 12, and 13 is a bolt.

[9. Problems to be solved] Incidentally, in such a synchronous machine, heat is radiated by the fin lO provided on the housing 7, but there is no device that covers the rotational output side of the housing 7. For example, when the rotating shaft 1 is connected to an electric eye movement type transmission 20 as shown in FIG.
The housing 7 surface on the rotational output side cannot be cooled, and a temperature difference occurs between the rotational output side and the opposite side, and the high temperature demagnetization effect of the armature iron core 5 on the rotational output side disrupts the balance on both sides, resulting in a decrease in efficiency. Furthermore, there is a problem that the armature winding 6 and the like may be burnt out.

Therefore, an object of the present invention is to enable cooling when the rotational output side of the housing 7 is covered by some kind of device.

(Means for solving the problems) In order to achieve the above-mentioned problems and solve the problems of the prior art,
In the present invention, a refrigerant flow path through which a refrigerant flows is provided on the rotational output side of the housing.

(Example) FIGS. 1 and 2 show an example of a permanent magnet field synchronous machine according to the present invention.

This is provided with a refrigerant passage 15 on the rotational output side of the housing 7 through which a cooling medium such as water or oil flows. As shown in FIG.
It is supposed to flow out from. Incidentally, other parts are the same as those of the conventional one, so the same reference numerals as in FIG. 4 are given, and redundant explanation will be omitted.

Therefore, with this configuration, even if the transmission 20 of an electric vehicle is disposed on the rotational output side and the housing 7 is covered, a cooling medium such as water or oil cannot be allowed to flow through the cooling medium flow path 15. This allows the armature winding 6 and the like on the rotational output side to be sufficiently cooled. In addition, when the transmission 20 disposed is an automatic transmission, transmission oil may be introduced as a cooling medium. Additionally, a dedicated cooling water system may be provided separately. Further, the housing surface opposite to the side where the refrigerant flow path 15 is provided is air-cooled as in the conventional case.

FIG. 3 shows another embodiment of the refrigerant flow path according to the present invention. This is restricted by the partition walls 18, 19 to the refrigerant flow path 15.
The inside is divided into several flow paths, and the cooling medium entering from the inlet 16 flows sequentially from the inner flow path closer to the rotation axis l to the outer flow path as shown by the arrow in the figure. This is based on the fact that since there are fins 10 on the outside of the synchronous machine, a certain amount of heat is dissipated, so the temperature distribution becomes lower toward the outside. Therefore, the cooling efficiency is improved by causing the cooling medium to flow from the inner flow path to the outer flow path.

〔Effect of the invention〕

As explained above, according to the present invention, since the refrigerant path for flowing the cooling medium is provided in the housing on the rotational output side, even if the housing surface on the rotational output side is covered with some kind of equipment, the armature winding and electricity can be removed. It is possible to sufficiently cool the child cores and the like, improving efficiency and preventing them from burning out.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing the first embodiment of the present invention;
The figures are a view in the direction of the ■ arrow in Fig. 1, Fig. 3 is a view showing another embodiment of the refrigerant flow path according to the present invention, Fig. 4 is a partial sectional view showing the configuration of a conventional synchronous machine, and Fig. 5 This is a diagram when a transmission is connected to a conventional synchronous machine. l... Rotating shaft 2... Rotor 3... Permanent magnet 5... Armature core 6... Electric pre-winding j!
I 7...Housing 8...Spacer
9... Bolt 10... Fin 15... Refrigerant channel 16... Inlet 17... Outlet 18
．． 19-...Bulkhead 20...Transmission patent applicant Nissan Motor Co., Ltd. Agent Patent attorney Hajime Tsuchibashi ) aS4 figure

Claims (1)

[Claims] Permanent magnet field synchronization in which a disk-shaped rotor with a plurality of permanent magnets arranged in the circumferential direction with magnetization directions parallel to the rotation axis is housed in a housing having armature windings and an armature core. A permanent magnet field synchronous machine, characterized in that a refrigerant flow path for flowing a cooling medium is provided on the rotational output side of the housing.